Westerbeke engine water pump

[Jack Dokter]

It looks like I'm in the market for a new water pump for our Westerbeke W21.  There is blackish-grey slimy substance emitting from the small drain hole located behind the belt pulley.  I'm assuming the internal seal is allowing coolant to enter the bearings.

Has anyone taken the time to have this pump rebuilt?  Is there a rebuild kit available? Or, is it best to just throw in the towel and buy the $350 unit?

Jack Dokter

Nine Lives 1983 26C W21 #099

Penetanguishene, Ont

[Larry Jack]

Jack,

These seals wear out periodically and are readily replaceable by a qualified pump shop. The most difficult part is removing the pump.

Make sure they/you inspect the shaft for wear spots/grooves and that it is perfectly smooth. A good time to replace the impeller, as well.

If I recall correctly there are 2 seals – an inner and outer. If so, would replace both.

Good luck,

Larry Jack NU 261 ‘Felina”  (regretfully for sale)

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[Joe Valinoti]

Jack:  If you can’t rebuild it yourself, it’s probably better to buy a new one.  Normally when you take the pump apart, the shaft and bearings are worn in addition to the two seals.  The original pump #24143 had been changed to 37431 which was also changed to 48500.  This fits all the W13, 18, 21, 27, 27A & 33 engines.  I bought one in February for $422 plus shipping.  If you can buy it for $350, buy it and let me know who sold it to you.

 

Joe Valinoti
S/V IL Gatto NS30U #221
Sea Harbour YC
Oriental, NC USA

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From: Jack Dokter

Sent: Sunday, June 29, 2014 11:32 AM

To: ina-nonsuch-discussion-group

Subject: Westerbeke engine water pump

 

[Jack Dokter]

The part number I have in my manual is Westerbeke #030591. (now obsolete, except for some left over stock inventory)

But...I also noticed "AISIN" embossed on the hose connection.  That part number comes up AISIN#  WPM-036 for $90 at a tractor parts supplier.  It sure looks the same.... except for that high-tech red Westerbeke engine paint is omitted.  

I know the Westerbeke W21 is a marinized Mitsubishi K3D engine block, but I'm curious to know if the water pump was part of the original Mitsubishi block, or was it part of the Westerbeke marine retrofitting?

Jack Dokter

Penetanguishene Ont

26C  #099  W21 

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[Jim Cosgrove]

Joe,
Where would I find the part number on the exiting pump to know which of the three versions I have?  Or is there another way to tell? And are the impellers the same for all three pumps?
Thanks,
Jim

Jim Cosgrove
FATE 30U #343
Galesville, MD

On 6/29/2014 1:07 PM, Joe Valinoti wrote:

[Jack Dokter]

Guys....let's make sure we are talking about the same pump.  The one I'm referring to is mounted on the front of the engine and is used to recirculate the engine coolant; and is driven by a V-belt.  I believe the one Joe is mentioning is regarding the fresh water pump that supplies "sea water" to the heat exchanger and exits via the exhaust riser.

Jack Dokter

Nine Lives

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[Greg Jeans]

This is your man http://www.johnstuartpowerbrake.com/Auto-Water-Pumps.page 

He rebuilt mine last year and turned it around in three days. He was very reasonable.

Greg Jeans

Cat Nap

NS30c #135

Nova Scotia

[Joe Valinoti]

Ahah!!  Yes, the circ pump is a Mitsubishi item and much cheaper.  Google the K3D circulation pump and it’s less expensive then a raw water pump.  They cannot be rebuilt.  I replaced mine about six years ago and got it from Ocean Marine in Portsmouth, VA.  Also, try Trans Atlantic Diesel in VA. 

 

Joe Valinoti
S/V IL Gatto NS30U #221
Sea Harbour YC
Oriental, NC USA

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[Greg Jeans]

Hi Joe,

Stewart actually called it "remanufacturing". Anyways they returned the same pump I sent them, just like new and so far it works fine...knock on wood.

Greg Jeans

Cat Nap

NS30c

#135

Nova Scotia

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Jack Dokter

Nine Lives 1983 26C W21 #099

Penetanguishene, Ont

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[Jack Dokter]

I just found out from NCW Tractor, they have a complete rebuild kit for $50, plus shipping.  Comes with bearings, 2 seals, and both the internal and external backing plate gaskets.  Maybe a way to go if anyone is handy and interested in "tinkering" with something.

Jack Dokter

Nine Lives

099 W21 26C

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